Carburetor



Oct. 29, 1929. D. J. DICKERS'ON CARBURE TOR Filed May 8, 192

2 Sheets$hee1 D. J. DICKERSON CARBURETOR 1 May 1928 Oct. 29, 1929.

2 Sheets-Sheet gwwmtoo ,D /bem Jf Dmerson Patented 19 29 13150- sr-AresPATENT. OFFICE DELBEBT J. mcxnnson, or sear LAKE CITY, nrran'Application filed May 8, i928. Serial 30. 275,988.

My invention relatesto carburetors andhas I and which willincrease thepercentage ofvaporization .of the fuel before it is intro-" ducedintothe combustion engine giving bet-,

1 ter acceleration and smoother running for the automobile with lessexpense and with less eifortrquired by the motor.

These objects I accomplish with the device illustrated in theaccompanying drawings in which similar numerals and letters of referenceindicate like parts throughout the several views and as described in thespecification forming a partof this applica tion and pointed out in theappended claims. In the drawings I have shown the best and mostpreferred manner of building my invention. Figure 1 is a side elevationof the device. Figure 2 is an end view of the same. Figure 3 is asection on "line 33 of Figure 2. Figure 4 is a side elevation of thedevice taken from the reverse side-from that shown in Figure 1. Figure 5is a section on line 5-5 of Figure 1) Figure '6 is a section on line 6-6of Figu e 4. e a h In thed awings I have shown the float chamber of mycarburetor as A in which a float B is pivotally mounted by the pin 1,and with a valve actuating lever 2 formed on the top side of-saidfloat'adapted to engage against the lower end of the check valve 3 andclose the'intake port 4 from the intake pipe 5 which leads from the?storage tank or vacuum tank (not shown). The main body member of thecarburetor I have shown as C, which body member is secured to the floatchamberby the bolts 6. l 4

The said mixing chamber is provided with the usual flange 7 where it issecured'to the intake manifold of the engine, and the mixing chamber 10is formed byconstructing a cylindrical bore or opening 8 through thebody member 0 at an angle to the general level P of the entire device sothat any gasoline left therein will drain down into the intake manifoldand also so that the incoming air will;

have a downward trend that will give a whirllng motion when it reachesthe intake manifold. The air opening end 90f the cylindrical bore 8 ismade rectangular and is provided wlth a closure flap valve 11, whichvalve is pivoted therein by the pivot pin 12, and in normal position isheld in the partially open position indicated in Figure 3, but which=valve opens wide open when the engine is running full speed or full loadby the increased suction of the pistons and which may be entirely closedas indicated by the dotted lines a-- when the choke lever L is operated.This shuts off all the air and provides a rich mixture for the enginewhile starting it. A throttle valve 14 is pivoted within the opening end8 and is operated by the bell crank lever 15 mounted on the outer end ofthe pivot shaft 16. I then provide a stop boss 17 on one side of theflange 7, and one end18 of the bell crank lever 15 is provided with anadjustment screw 19 which screw 19 is tapered on one end and is providedwith a knurled head on the other end. I then bore a hole 20 through theboss 17 connecting the interior of the opening 8 with the outer air,-and provide a closure plug 21 for the outer end of the said hole. I borea hole 22 at right angles to the hole 20 through one side of the boss 17into and in open connection with the hole 20 as shown in Figure 5 of thedrawings. The tapered end of the screw 19 is adapted toflt into andcompletely close the hole 22 when the engine is idling, but is movedaway from the end of the hole, opening it, to allow air to passtherethrough into the hole 20 and into the mixing chamber when thethrottle lever 15 is actuated.

I then provide a boss 2 on the bottom side of the body member C. throughwhich I secure the spray nozzle 25, which nozzle'has the lower endthereof submerged within the gasoline fuel in the float chamber and thetop end of which is open to the interior of the mixing chamber 10, andthe said nozzle is. so laced within the chamber 10 that the back side 26thereof is higher than the front side 27. I then bore a transverse hole28 through a boss 29 formed on the body member G and provide anadjustment screw 30 threaded into the outer end of the said hole.

On the one side of the body member C and above the.boss 29 I form asemicircular casing 31, which casing 31, has a boss 32 on the innerlower side thereof adjacent the boss 29 and I bore a hole 33 through theboss 32 into and in open connection with the hole 28. The adjustmentscrew-30 completely closes the outer end of the hole 28 and when screwedinwardly closes the hole partially as may be necessary for completelyhole 25 and partially break the vacuum therein mixing with the gasolinepassing therethrou hbefore it is thrown or drawn out into t e mixingchamber 10. As a control for ,theopening of the hole 33 I provide alever 35, which lever is mounted on one end of the pivot pin 12, and isrotated therewith. The said lever 35 isformed as shown in Figure 4 ofthe drawings with one end 36 adapted to partially close the hole 33,-

and with the other end 37 to completely close the hole 33 when it isbrought thereover. The intervening space between the ends 36 and 37 iscurved slightly from the end 37 to a major curve 38 which allows thehole33 to be completely open when that portion of the lever 35 is thereover,which is usual at the intermediate speed of the engine giving full flowof air therethrough. A spring 39 is secured to the said lever 35 nearthe pivoted end thereof and the other end of the said spring is securedto an adjustment screw 40 which screw is threaded through the wall ofthe semicircular casing 31, and which screw is used to adjust thetension of the spring 39 on the lever 35. Dotted lines b indicate theposition the lever 35 will take when the throttle is wide open and theflap valve 11 is wide open allowing the full amount of air to passtherethrough and completely closing the hole 33. As shown in thedrawings the lever 35 may be moved in the other direction enough tocompletely close the hole 33 when the choke lever L is being used instarting the car. The.

choke lever L is mounted on the main body from the casing 31 and isprovided with an I excentric cam '41 and a compensating curved leafsprin 42 is secured to the lower end of the sai lever L. I' then providea lever 43 mounted on' the end of the pivot pin 12 on the opposite endfrom the lever 35, which lever 43- is bored and threaded on its'outerfree end through which an adjustment screw 44 is passed, with the end ofthe said screw adapted toengage over the surface of the cam 41. A pin 45is secured in;the lever the spring presses thereon, which-movement ofthe lever 43 partially rotates the pin 12 and closes the hole 33 bymoving the lever 35 thereover, and closes the opening 9. As soon as theengine starts thervalve 11 will be drawn open by the suction of thepistons actuating the spring 42. Near the medial portion of the lever 43I pivot a connecting rod 47 which rod is provided with a pivot joint 48therein and the lower end of the said rod is secured to a small piston49 which piston is carried in a dash pot 50 which dash.

pot 50 is within and secured on the lower side of the float chamber A. Asmall hole 51 is bored through the piston 49 to allow passage of fluidtherethrough.

The operation of my carburetor is as follows:

When the driver wishes to start his engine he pulls the choke lever,drawing the lever L forward which action moves the cam 41 and forces thespring 42 against the pin 45 closin the flap-valve 11 in the opening 9and closing the hole 33 by the movement of the lever 35. As soon as theengine starts the suction of the pistons will draw the valve 11 openactuating the spring 42 giving a fluctuating movement of the valve 11 gand with the spnng forcing against the move ment of the said valve.

that it will not open suddenly. When the engine is accelerated to theintermediate speed the curve 38 of thelever 35 is directly above thehole 33, allowing full opening of the hole and directing all the airthrough the hole 33 and the hole 28 into the hole 25 of thenozzle 25.Also as the throttle is opened by the driver more air is allowed toenter through the holes 22- and 20' into the bore 8. As the speed of theengine is increased by opening the throttle wider the flap valve 11 isdrawn proportionately open, .comensurate with the speed, and as thevalve 11 opens the hole 33 is slowl closed by the curve nearing the end37 of t e lever 35 until as the maximum speedof the engine is attainedthe valve 11 is wide open and the hole 33 is completely closed allowingthe maximum amount of air to enter through the openin 9. but shuttingoff all of the air through t e hole 33 into the bore 25 of the nozle 25,and the nozzle 25 will then be carrying full flow of gasoline.

The spring 39 will draw the lever-35 to starting position when the.throttle is closed and is also a means for regulating the amount thatthe valve 11 will open under varying suctions from the motor. Also theholes 22 and are drawing the full amount of air therethrough but as thevacuum suction of the engine is greater the air will not be drawnthrough the holes 22 and 20 with as much velocity as when the engine isin intermediate speed. The dash pot 50 and its component parts controlthe movement of the valve 11 so that its movement is not as rapid as insome cases.

Having thus described my invention I desire to secure by Letters Patentand claim:

1. In a carburetor the combination of a float chamber; a float mountedwithin said chamber adapted to control the inflow of gasoline; a mainbody member mounted above said float chamber having a bore therein at aslight angle to the horizontal plane of the float chamber; a nozzleprojecting into said bore and communicating with the gasoline in thefloat chamber; a transverse bore connecting the bore in the nozzle withan air hole at right angles to the transverse bore;

a flap valve pivoted in one end of said main body member; a throttlevalve pivoted in the other end of said bod member; a choke lever mountedonone sideo said body member having a cam formed thereon; a levermounted on the same pin as the flap valve is pivoted; a curved leafspring mounted on the lower end of said choke lever; a pin protruding onsaid lever against which said spring is adapted to operate when thechoke lever has been operated; an arm plate mounted on the other end ofthe pin on which the flap valve is mounted; having the periphery thereofadapted to move over the top of the air hole at right angles to thetransverse bore, to open or close it partially or entirely as necessaryand actuated by the suction of the pistons; a dash pot mounted withinthe float chamber; means of'connecting said dash pot with said arm plateto control the movement of the flap valve when the throttle is beingoperated.

2. In a carburetor the combination of a float chamber mounted below amain body member with the bore of the bod member sloping toward theintake manifo d connection; a nozzle to draw gasoline from the floatchamber to themain bore; a set of air holes connecting the interior ofsaid nozzle with the '0 on air; a curved lever ada ted to control txamount of air passing t roughsaid set of h air into the main bore; adash pot to control the movement of the flap valve and means to chokethe carburetor by closing the flap valve and the air holes at the sametime.

In testimony whereof I have afiixed my signature. 7

DELBERT J. DICKERSON.

les; a flap valve to control the flow of v

